Process of finishing the surfaces of rolls, dies, &amp;c.



No. 861,558. PATENTED JULY 30, 1907.

R. c. TOTTEN.

PROCESS OF FINISHING THE SURFAGBS 0F ROLLS, DIES, 8:0. arruomron nun MAY 6. 190a.

FIG.2 v Y F 3 I I a was QIiNESSES. v p INVENTOR.

To all whom it may concern:

"UNITED sm es PATENTJLOFFICEIQ ROBERT C. TOTTEN, 0F PITTSBURG, PENNSYLVANIA.

PROCESS OF FINISHING TEE SURFACES OF ROLLS, DIES, &(:.

Specification of Letters Patent.

' Patented July 30,190".

Application filed May 5, 1906. Serial No. 315,401-

Be it known that I, Router 0. TorrsN, a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful I mrolls used in sheet and other mills, and as the invention is illustrated as well in connection with suchlrolls as with other articles, I will describe'the same when applied thereto, but it will be understood that no limitation is to be imposed on thexclaims by reason of such illustration and description.

Rolls for reducing metal are formed by casting in chill molds so as to give a hard wearing face to the roll, while the center or body thereof remains soft or of gray iron. All such rolls are subjected to alternate contractions and expansions which cause the chilled surface to form innumerable minute cracks, which are scarcely visible but which in use pick up the scale and cause the same to adhere to the roll, tl'ius cutting and working into the surface of the roll and soon toughening it to such. an extent that it must be turned down. This,.however, removes a portion of the chilled or hardened surface and the dressed roll has not as hard a surface as it should have and will again quickly roughen. After a few dressings the entire chilled exterior is removed and the roll must be thrown away as useless. The expense of renewing chilled rolls from this cause is a very important item of cost in sheet metal mills.

The object of this invention is to so treat the working or wearing surfaces of such chilled rolls, as well as of all other forms of rolls, dies, journals, bearings, car wheels, tires, etc., that the foregoing difficulties are overcome and a hard, smooth, comparatively frictionless and a very enduring surface is formed thereon. I

My .invention is based on the principle that a very smooth hard wearing surface greatly reduces friction and wear and preventsscale and other foreign substances from adhering there'toj the heating of the article causes the nickel coating. to

firmly weld to the iron backing and prevents said coat-- ing from chipping or flaking off in use.

In the accompanying drawing the invention is illus tratcd as applied to the treatment of chilled rolls and Figure 1 is a diagrammatic view illustrating the electro-plating thereof; Fig. '2 is a similar view illustrating the welding thereof; and Fig. 3.is a longitudinal section through a chilled roll indicating the different charactcrsof metal therein. I t I The roll 1, or other article to be treated, is formed by casting, or other manner, and may be cast in. a chill mold in the usual way to give the soft gray iron-bodyor interior 2 and the hard or chilled exterior surface 3.

The casting is done in the usual way. The article is then covered with a. thin coating of nickel, preferably by electro-plating the same thereon. This can conveniently be done .by placing the article in a suitable bath 6 composed of a solution of nickel, or other metal of the nickel group, or combinations of the same, and

has connected thereto one pole 7 of'an' electric'eircuit while the other pole 8 is connected to a plate 9 in said bath. This deposits the nickel or similar metal on the surface of the article in the well understood manner of clectro-plating. The clc'ctro plated article is then raised to a sufficiently high temperature to cause the nickel coating to firmly weld-to the iron backing. This can be accomplished in any suitable way, such as by placing the same in a suitable heating furnace ll, shown in Fig. 2; The surface may be afterwards, if desired, further smoothcned byburnishing in the usual way. Old or worn articles maybe treated in the-same way by first dressing down the worn surface. and then subjecting to the electrolytic bath.

I The clectro plating results in filling up all minute cracks or other inequalities or depressions in the surface of the article, thus giving a very smooth exterior. The heating of the article causes the coating to so firmly weld to the iron backing that it cannot chip,- flakc or scrape off in use. has an exceedingly smoothand hard surface which greatly reduces friction and wear and prevents the scale, inicase of rolls and the like, from adhering thereto.

The life of such wearing surface is very many times greater than of a similar article uncoated with nickel.

My invention may be applied to the treatment of the working surfaces of nnchilled rolls or. other articles.

As a consequence the article The manner of treating such articles 'will be obvious 1. -'lhe process of forming hard smooth wearing surfaces on cast iron articles of the character specified which 'con-' sisis iu electroplating ilhnworking or wearing face or l'zu-vs thereof withlinictal fnf the nickel group, and then healing said coated article in cause the coating to weld to the iron body.

2. The process of forming cast iron articles with hard smooth wearing faces consisting in casting such articles in chill molds, then electro-piatlng the working or wearing nice or faces thereof with metal of the nickel group, and

'linnlly heating such coated articles to cause the coating to wold'ltothe' iro'n'body. i

' hereunto set my hand.

' iron body.

In testimony'wh'ereof, I the said ROBERT C. TOTTEN have ROBERT C. TOTTEN. 

